Economists have gotten into a big fight with each other about the potential economic impacts of Bernie Sanders’ proposals. First Gerald Friedman came out with a new paper anticipating a tremendous improvement in economic performance under Sanders. Then four economists (Krueger, Goolsbee, Romer, and Tyson) affiliated with the Obama and Clinton administrations wrote a joint letter asserting that Friedman’s claims “cannot be supported by the economic evidence”. Paul Krugman subsequently took their side on his popular blog. Others have defended Friedman–Jamie Galbraith accuses the four of not having rigorously reviewed the paper, while Dean Baker claims that the New York Times is not giving Sanders’ side a platform and that there’s far more support among economists than we are being led to believe. In the popular press, this argument has rapidly devolved into a question of which authorities are more or less credible. I want to give you something better–a readable analysis of the actual arguments at stake here.